在此页

• 摘要
• 特性
• 方法
• 规范
• 另请参阅
• 相关话题

非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

摘要

LockedFile interface provides tools to deal with a given file with all the necessary locks.

特性

LockedFile.fileHandle 只读

FileHandle object from which the lock was opened.

LockedFile.mode 只读

The mode for accessing the file; can be readonly or readwrite .

LockedFile.active 只读

A flag indicating if the file can be accessed ( true ) 或不 ( false ).

LockedFile.location

The position of the reading/writing pointer within the file.

Events Handler

LockedFile.oncomplete

complete event is triggered each time a read or write operation is successful.

LockedFile.onabort

abort event is triggered each time the abort() 方法被调用。

LockedFile.onerror

error event is triggered each time something goes wrong.

方法

LockedFile.getMetadata()

Allows to retrieve the file metadata (size and date of the last modification). Returns a FileRequest .

LockedFile.readAsArrayBuffer()

Allows to retrieve a part of the content of the file as an ArrayBuffer 。返回 FileRequest 对象。

LockedFile.readAsText()

Allows to retrieve a part of the content of the file as a string. Returns a FileRequest 对象。

LockedFile.write()

Allows to write some data in the file starting at the location offset. Returns a FileRequest 对象。

LockedFile.append()

Allows to write some data at the end of the file. Returns a FileRequest 对象。

LockedFile.truncate()

Allows to truncate the file's content. Returns a FileRequest 对象。

LockedFile.flush()

Allows to guarantee that any buffered data has been transferred to disk.

LockedFile.abort()

Makes the LockedFile inactive and cancels all ongoing operations.

规范

规范	状态	注释
FileSystem API	编者草案	Draft proposal.

另请参阅

• FileHandle
• FileRequest

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. 文件和目录条目 API
2. LockedFile
3. 特性

   1. active
   2. fileHandle
   3. location
   4. mode
   5. onabort
   6. oncomplete
   7. onerror
4. 方法

   1. abort()
   2. append()
   3. flush()
   4. getMetadata()
   5. readAsArrayBuffer()
   6. readAsText()
   7. truncate()
   8. write()
5. 事件

   1. error
   2. writeend
6. 文件系统 API 相关页面

   1. FileError
   2. FileException
   3. FileHandle
   4. FileRequest
   5. FileSystem
   6. FileSystemDirectoryEntry
   7. FileSystemDirectoryEntrySync
   8. FileSystemDirectoryReader
   9. FileSystemDirectoryReaderSync
   10. FileSystemEntry
   11. FileSystemEntrySync
   12. FileSystemFileEntry
   13. FileSystemFileEntrySync
   14. FileSystemFlags
   15. FileSystemSync
   16. HTMLInputElement
   17. LocalFileSystem
   18. LocalFileSystemSync
   19. 元数据
   20. Window.requestFileSystem()
   21. Window.resolveLocalFileSystemURL()
   22. WorkerGlobalScope.requestFileSystemSync()